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Old 10-27-2011, 01:59 PM   #151
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Originally Posted by doperide07 View Post
...245 is running super duper rich...suspect the AMM
1. Install new heated O2 Sensor

2. Yes, maybe AMM

3. Plug off brake power-booster's vacuum hose.
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Old 11-15-2011, 10:16 PM   #152
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Fuelly is a site that tracks your gas mileage over time, helping you calculate fuel expenses as you drive.

Fuelly was built by Matt and Paul in a little over two weeks during July 2008. The idea started with building a MPG history calculator app, but making it web-based and multi-user so you could compare cars and drivers across the system. New feature suggestions are always welcome in the Forum.
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Old 05-14-2014, 01:54 PM   #153
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bump for eco-bricks

our '86 745 managed to get 36.7 mpg on a trip from clearwater,fl to perry,fl
no receipts saved,but it is possible.

'86 745 m46,n/a lh2.2 kept in od 90% of the time cool night tires at 40psi had high beams on because of deer and averaged 45-55 mph the whole way through,no a/c windows down.

i put in $35 when we got back and was astonished to see the pump clicked at $18..
fwiw the car averages ~18-21 city
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Old 05-14-2014, 10:06 PM   #154
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D24...........nuff said
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Old 05-14-2014, 10:58 PM   #155
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those dam nazis..
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Old 05-15-2014, 12:39 AM   #156
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averaged about 31.5 over a 200 mile stretch last week.

89 245, aw70, no a/c, windows down, 55-60, about 80 degrees, heat on because it was overheating.

the rest of the 1100 mile trip it was between 27-28.
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Old 05-15-2014, 01:19 AM   #157
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averaged about 31.5 over a 200 mile stretch last week.
Distance is too short....each fuel station can have different pump pressure, which affects when pump shuts off.

AW70 - It would require flatish land with wind to your tail, and 89 Octane fuel to hit 30-mpg.

At 55 mph for your vehicle, torque converter's stall speed would be reached at that speed range...which is where peak fuel efficiency would be.

With rebuilt B23F using Rex/Regina ignition/fuel system, using 89 Octane fuel, with AW71L transmission in 93-944, I average 25-27 mpg on slight hilly terrain at 55 mph doing mostly hwy miles, some city. On flat ground, I suspect around 30 mpg in no wind conditions.
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Old 05-15-2014, 01:28 AM   #158
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Distance is too short....each fuel station can have different pump pressure, which affects when pump shuts off.

AW70 - It would require flatish land with wind to your tail, and 89 Octane fuel to hit 30-mpg.

At 55 mph for your vehicle, torque converter's stall speed would be reached at that speed range...which is where peak fuel efficiency would be.

With rebuilt B23F using Rex/Regina ignition/fuel system, using 89 Octane fuel, with AW71L transmission in 93-944, I average 25-27 mpg on slight hilly terrain at 55 mph doing mostly hwy miles, some city. On flat ground, I suspect around 30 mpg in no wind conditions.
it was on flat ground with a tailwind of about 15-20mph. it was in missouri so it was close to 10% ethanol additives so it likely was 89 octane.

regardless, it never averaged below 27mpg which is pretty good for the old girl with 318k miles.
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Old 05-15-2014, 01:37 AM   #159
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hmm i don't drive that eco... when i bought my car it was doing 12.7 mpg.... old b20 on LPG after some adjustments i was doing 19.7 mpg... i hope when the new engine is in and the ECU installed i can go up to at least 31,1 mpg on lpg.... and that in an old 242
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Old 05-15-2014, 08:51 AM   #160
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In my Volvo 360, i have a b230fb which averages 30mpg. This engine has the vx3 cam. Should I switch to a Y, M or even T cam or should I keep the vx3 which has the newest design?

Ofcourse the 9.3:1 compression isn't helping but I will change that.
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Old 05-15-2014, 09:41 AM   #161
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I just want to note that I've managed 35+ on trips to Wisconsin in the s60, does that count?
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Old 05-15-2014, 10:23 AM   #162
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I would be interested to know the mileage of a B230KH (631 Heron head with T-cam and high CR) , it came in the euro-market 740's and was specially designed for good mileage.
Anybody ever ran a B230KH using EFi? +T-ed?
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Old 05-15-2014, 01:47 PM   #163
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I just want to note that I've managed 35+ on trips to Wisconsin in the s60, does that count?
Mythbusters Studies Drafting


55mph - no vehicles in front - 32mpg

Drafting @100 feet - 35.5mpg (+10%)

Drafting at 50 feet - 38.5mpg (+20%)

Drafting at 20 feet - 40.5mpg (+27%)

Drafting at 10 feet - 44.5mpg (+39%)

Drafting at 2 feet - 41.0mpg (+28%)

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Old 05-15-2014, 02:05 PM   #164
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I would be interested to know the mileage...
Timing advance, is the question...if default ECM/ECU limits timing boundaries, then I doubt if better mileage would exist.

Fuel Octane - Higher octane is better when ECM/ECU has more latitude in timing advance, but many vehicles will see no improvement, due to default timing maps.

Timing Objective - Advance timing until it pings, then back off a pinch. Also, ECM/ECUs that can control timing on each cylinder will do much better on mpg.
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Old 05-15-2014, 06:30 PM   #165
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I don't find 55MPH to be good on fuel in a 240, between 80 and 90 in a 240GLT seems to give the best cruising consumption from my experience. Lower geared cars are better more like around 70-75MPH.
On LPG cruising at 80-90MPH usually see about 25-27MPG (real gallons not US half measures - works just over 30MPG for US)
Petrol should give about 20% gain so that should be just over 30MPG
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Old 05-15-2014, 08:56 PM   #166
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Driving economically on the freeway

You’ll use less fuel and save money if you:

drive more slowly – travelling at 90 km/h rather than 110 km/h will reduce fuel use by up to 25%
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Old 05-16-2014, 11:41 AM   #167
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Originally Posted by Joris View Post
In my Volvo 360, i have a b230fb which averages 30mpg. This engine has the vx3 cam. Should I switch to a Y, M or even T cam or should I keep the vx3 which has the newest design?

Ofcourse the 9.3:1 compression isn't helping but I will change that.
T cam will produce more dynamic compression because of the lower duration/lift and will increase your low end torque and gas mileage some.
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Old 05-16-2014, 04:35 PM   #168
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Originally Posted by 84B23F View Post
Driving economically on the freeway

You’ll use less fuel and save money if you:

drive more slowly – travelling at 90 km/h rather than 110 km/h will reduce fuel use by up to 25%
To do 90km/h is around 2000 rpm in a GLT - its never going to like being just off tick over in top gear. About 3000RPM is just on cam and gives about the best consumption
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Old 05-16-2014, 06:27 PM   #169
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Originally Posted by classicswede View Post
3000 RPM...best consumption
Overdrive - An overdrive (OD) is a mechanism that allows an automobile to cruise at sustained speed with reduced engine RPM, leading to better fuel economy, lower noise, and lower wear.[1]

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Old 05-16-2014, 08:42 PM   #170
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Isn't that the reason modern cars have a 6th gear nowadays? To drop the RPM's right down and to make it so you have to open the throttle plate wider = less pumping losses = better MPG.

Regarding one of 84B23F's old links concerning Brake Specific Fuel Consumption:
http://www.autospeed.com/cms/article.html?&A=112611

So what is the absolute best RPM to maximise MPG for town-ish driving (say 35 mph). At that speed in 3rd gear the RPM is 2500, in 4th it's 1900, and in 5th it's about 1200!

I could lug it along in 5th with the throttle plate needing to be open wider to maintain that speed, but according to that article the RPM would be too low and the "SFC suffers because there's increased time for the heat of combustion to escape through the walls of the cylinders".

On the other hand, if I use 3rd the RPM's are in the 'ideal range' according to the article diagrams, but I would only be using about 10% throttle = higher pumping losses = higher SFC.
Maybe 4th is best, but I'm confused...
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Old 05-16-2014, 09:34 PM   #171
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Originally Posted by baggins798 View Post
6th gear nowadays?
Over the road semi-truck engines, many years ago, ran around 2100 RPM highway RPM; then some thirty years ago, they were dropped back to around 1350 RPM range for highway driving. Same with newest automobiles, with six speed boxes. their RPM is dropped back.

Quote:
what is the absolute best RPM to maximise MPG for town-ish driving (say 35 mph)
"

Stick Shifts Info


For example, anything that allows you to keep the throttle open wider and the revs lower (like changing up to a tall gear and then holding it) will reduce fuel consumption because BSFC will be improved. But equally, recycling exhaust gas (ie EGR) might also achieve that same effect because pumping losses will be reduced - not all the inlet charge needing to come past the throttle. "

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Old 05-21-2014, 06:07 PM   #172
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Originally Posted by klr142 View Post
T cam will produce more dynamic compression because of the lower duration/lift and will increase your low end torque and gas mileage some.
Other threads on here claim that the T cam does even better in the low end if you advance it by a few degrees. Naturally you're cruising in the low end of your RPM range, even if you're on the highway, so better low-end torque = engine works less hard at cruise = higher MPG.

I'm gonna try the T-cam thing in my NA 745 at some point. Trying to figure out if it needs a head gasket now, and if I have to pull the head and get it worked on, that's the obvious time to switch cams.
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Old 05-23-2014, 02:08 PM   #173
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Quote:
Originally Posted by Janspeed View Post
I would be interested to know the mileage of a B230KH (631 Heron head with T-cam and high CR) , it came in the euro-market 740's and was specially designed for good mileage.
Anybody ever ran a B230KH using EFi? +T-ed?
Same..never knew Volvo made a eco-b230,doesn't that defy physics or something/?

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Old 05-23-2014, 03:03 PM   #174
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Originally Posted by blandoon View Post
Other threads on here claim that the T cam does even better in the low end....
In US, and in Europe, since government mandated fuel mileage testing, ALL OEMs peak engines towards best/better fuel mileage as based upon test routine. But, they know that many consumers want some pedal-to-the-metal power also.

All engines I'm aware of, for best fuel economy, work best at lower RPMs. For lower horsepower engines, you loose pedal-power when taller OD gearing exist. So, if your cam favors better torque at lower RPMs, then these cams would work better.

To cruise at around 60 mph requires around 30 horsepower in no wind conditions...hence, if best fuel burn is wanted, get out horsepower/torque chart, and re-gear transmission/rear-end, and maybe change tire size also.
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Old 05-26-2014, 10:13 PM   #175
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Quote:
Originally Posted by blandoon View Post
Other threads on here claim that the T cam does even better in the low end if you advance it by a few degrees. Naturally you're cruising in the low end of your RPM range, even if you're on the highway, so better low-end torque = engine works less hard at cruise = higher MPG.
No need to advance it. I don't think anyone has ever said to advance the T cam. I ran it retarded 4 degrees and it was a good mix for me.
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